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Diagnostic basis, the different configuration and application of motor rolling bearing! - bearing knowledge

by:Waxing     2020-05-31
Takeaway: today the content of this article is about the different configuration and application of motor rolling bearing, very practical experience, hope to help you work and study. The bearing of the motor ( The following are the rolling bearing) Is important between stator and rotor support components, to ensure motor air gap and uniform load, and so on, the correct selection and application of the bearing is an important part of motor design. Based on the different characteristics of the motor, such as their structure, load type, working speed, bearing life and so on, the bearing of the motor selection is different also, only the choice of appropriate bearing, to bearing the inherent characteristics of ensure the reliable operation of the motor. A, bearing configuration in order to better choose bearing configuration, must understand the bearing its own special agree. Bearing type many, here only to the commonly used two kinds of bearings: deep groove ball bearings and cylindrical roller bearings are explained in detail. If need to apply some special bearings, must find the relevant information, understand its characteristics. Deep groove ball bearing and roller bearing inner and outer ring is point contact. With quiet operation, low cost, can carry a range of radial load and axial load, the advantages of low friction, low calorific value, high speed turn; The drawback is that unable to bear impact load or radial and axial load. Cylindrical roller bearing and roller bearing inner and outer ring is line contact. Has the advantages of can bear radial load, are widely used in large and medium-sized motor and load for belt conveyor of big small and medium-sized motor; The downside is compared with the deep groove ball bearings, low rated speed, high noise. 1, a typical bearing configuration of motor bearing configuration and its installation way of the motor and load size, here only to horizontal IMB3 some typical bearing configuration is analyzed. 1) Deep groove ball bearings and deep groove ball bearing configuration: motor drive and the drive end adopt deep groove ball bearings, drive end for locating end, not the drive end bearing elastic preload, as shown in figure 1. Advantage is high speed, low noise, stable operation; The disadvantage is that can't bear radial load, load such as belt conveyor. This configuration is suitable for small and medium-sized motor light load of the load. 2) Deep groove ball bearing + cylindrical roller bearing configuration: motor drive end adopts cylindrical roller bearing, the drive end USES deep groove ball bearing positioning, as shown in figure 2. Advantage is the shaft extension end can withstand heavy load, the motor does not need the axial pre-tightening and reserved rotor axial thermal expansion gap; The disadvantage is that the two deep groove ball bearing configuration noise slightly tall, allowed speed slightly low, the load must accept the axial expansion. This configuration is suitable for large and medium-sized motor, a heavy load on the drive end. 3) Deep groove ball bearings, cylindrical roller bearings and cylindrical roller bearing configuration: motor driven end use + cylindrical roller bearing, deep groove ball bearing deep groove ball bearing and the bearing chamber radial clearance fit, and o-rings to prevent the bearing outer ring rotation, the drive end USES the cylindrical roller bearing, as shown in figure 3. Advantage is the shaft extension end can absorb a certain amount of axial load and radial load, axial can accept, do not need to preload the drive on the motor rotor of thermal expansion, big disadvantage is the noise of the machine, the bearing damage probability is higher ( Compared with the two bearing configuration) 。 This configuration is used for large motors. 2, the motor bearing configuration on the market at present is 1) Siemens high fZSi, electric hu bearing configuration: high voltage motor adopts three bearing configuration, Bearing for the light series) , as shown in figure 4. Low voltage motor adopts two bearing configuration, as shown in figure 5. 2) ABB motor bearing configuration: low voltage H355 machine base number one H500 adopts two bearing configuration, 2 series deep groove ball bearing) , as shown in figure 6. High pressure large motor adopts three bearing configuration, as shown in figure 7. 3) Some electric high voltage motor adopts three bearing configuration, the shaft extension end deep groove ball bearings for the light series bearings, same as the Siemens, as shown in figure 8. 2, summarize what has been discussed above, motor selecting bearing configuration, in various load cases should be allowed preference deep groove ball bearing + deep groove ball bearing configuration. If the drive end there are deep groove ball bearing radial load + deep groove ball bearing configuration can meet, should be the preferred + configuration of cylindrical roller bearing, deep groove ball bearing second choice deep groove ball bearings, cylindrical roller bearings and cylindrical roller bearing configuration or other bearing configuration.
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